[POWERPC] spufs: Add SPU register lock
spu->register_lock should be held before accessing registers. Signed-off-by: NKou Ishizaki <kou.ishizaki@toshiba.co.jp> Acked-by: NArnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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